Your question is a little unclear. Are you refering to the forearm which slides over the magazine tube? There are threads on the end of the tube that hold the forearm in place. Or are you refering to the butt stock.
A quick search I found this. Tube is about ten bucks fron remington along with a new nut for 4.00 or so. I lucked out and was able to clean up the threads with a 11/16 x 32 die. Then a new nut at local gun store. Make sure you got the washers in there. good luck.
I know this tube can be shortened SLIGHTLY, i've seen it done. I'll bet if you find the right smith, it can probably be cut off and rethreaded. Someone on here might have info on someone who can do this.
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